2012831781 has 4 divisors (see below), whose sum is σ = 2683775712. Its totient is φ = 1341887852.

The previous prime is 2012831761. The next prime is 2012831791. The reversal of 2012831781 is 1871382102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2012831781 - 2¹⁵ = 2012799013 is a prime.

It is a super-2 number, since 2×2012831781² = 8102983557207263922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012831731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335471961 + ... + 335471966.

It is an arithmetic number, because the mean of its divisors is an integer number (670943928).

Almost surely, 2^2012831781 is an apocalyptic number.

It is an amenable number.

2012831781 is a deficient number, since it is larger than the sum of its proper divisors (670943931).

2012831781 is an equidigital number, since it uses as much as digits as its factorization.

2012831781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670943930.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 2012831781 is about 44864.5938463729. The cubic root of 2012831781 is about 1262.6098129623.

The spelling of 2012831781 in words is "two billion, twelve million, eight hundred thirty-one thousand, seven hundred eighty-one".